Cost-effective low-power architecture of vestigial sideband W-CDMA system

We propose an architecture of a new frequency-efficient W-CDMA system that saves the spectrum from 36864 MHz to 2.458 MHz to accommodate the IS-95 narrowband CDMA system by using vestigial sideband (VSB) modulation. In addition, we introduce new cost-effective low-power design technique called CSD-CSCF (Canonical Signed Digit-Common Sub-coefficient Common Filter) and common energy calculator to alleviate the additional hardware cost that is needed to accomplish the VSB modulation and to obtain performance identical to that of the double sideband (DSB) system. It is shown that the proposed VSB W-CDMA system has 30% less spectrum than the DSB W-CDMA system and 30.6% less hardware cost than the system neither exploiting CSD-CSCF nor common energy calculator architectures.